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calling a subprocedure

i am coding for an online survey (in VBScript). on the click of the submit button, i wish for a function to be called which will check to see have all fields been filled out and if not, a message box to appear. here is a snippet of the code:
...survey....
<%
Sub Validate_onClick
'ERROR CATCHING
'question 2
If (Request("People") <> "") AND (Request.Form("Specify") <> "") Then
MsgBox "Please enter value for Q2"

You can't call a VBS sub-procedure with JavaScript (which is what you're trying to do). You'd have to have a separate ASP script checking the data AFTER it was posted to do it that way using your VBS function.